package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.*;
import com.rabbitmq.client.Channel;
import com.sun.org.apache.xpath.internal.operations.Bool;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

import javax.annotation.Resource;



@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Resource
    private WareSkuDao wareSkuDao;

    @Autowired
    private ProductFeignService productFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    OrderFeignService orderFeignService;



    /**
     * 1、解锁
     *      下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚，之前锁定的库存就要自动解锁
     * 2、订单失败
     *      锁库存失败
     *
     *  只要解锁库存的消息失败。一定要告诉服务器此次解锁失败。
     */

    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId){
        //库存解锁
        wareSkuDao.unlockStock(skuId,wareId,num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);//变为已解锁
        System.out.println("设置解锁状态2："+entity);
        orderTaskDetailService.updateById(entity);
    }


    @Override
    public PageUtils queryPage(Map<String, Object> params) {

        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();

        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            wrapper.eq("sku_id", skuId);
        }
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            wrapper.eq("ware_id", wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录
        List<WareSkuEntity> wareSkuEntities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (wareSkuEntities.size() == 0 || wareSkuEntities == null) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStockLocked(0);
            //TODO 第一种：远程查询sku名字 , 如果失败事务无需回滚
            //1、自己catch掉异常
            //TODO 第二种：还可以用什么办法让异常出现以后不回滚？高级部分将讲
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0) {
                    wareSkuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            wareSkuEntity.setSkuName("");

            wareSkuDao.insert(wareSkuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }

        //2、


    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            //select SUM(stock-stock_locked) FROM `wms_ware_sku` where sku_id=1
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     * rollbackFor = NoStockException.class
     * 默认只要是运行时异常都会回滚
     * @param vo
     *
     * 库存解锁的场景
     * 1）、下订单成功，订单过期没有支付被系统自动取消、被用户手动取消。都要解锁库存
     *
     * 2）、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚
     *      之前锁定的库存就要自动解锁
     *
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯容易。
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);

        //1、按照下单的收货地址，找到一个就近仓库，锁定库存
        //1、找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        //2、锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1、如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发送给MQ
            //2、锁定失败。前面保存的工作单信息就回滚了。发送出去的消息，即使要解锁记录，由于去数据库查不到id，所以就不用解锁
            //      1号商品 2锁成功 在1号仓库  2-1-2  3-1-1
            for (Long wareId : wareIds) {
                //成功就返回1，否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if(count==1){
                    //
                    skuStocked = true;
                    //TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(entity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity,stockDetailTo);
                    lockedTo.setDetail(stockDetailTo); //只发id不行，防止回滚以后找不到数据
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                }else{
                    //当前仓库锁失败，重试下一个仓库
                }
            }
            if(skuStocked == false){
                //当前商品所有仓库都没锁住
                throw new NoStockException(skuId);
            }
        }

        //3、能到这里肯定是锁成功的
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {

        StockDetailTo detail = to.getDetail();
        Long skuId = detail.getSkuId();
        Long detailId = detail.getId();
        //解锁
        //1、查询数据库关于这个订单的锁定库存信息
        //有：证明库存锁定成功了
//            解锁：订单情况
//                1、没有这个订单。必须解锁
//                2、有这个订单，不是解锁库存
//                      订单状态：已取消：解锁库存
//                              没取消：不能级锁
        //没有：库存锁定失败了，库存回滚了。这种情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if(byId!=null){
            //解锁
            Long id = to.getId();//库存工作单的id
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();//根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if(r.getCode() == 0){
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if(data == null || data.getStatus() == 4){
                    //订单不存在
                    //订单已经被取消了，才能解锁库存
                    if(byId.getLockStatus() == 1){
                        System.out.println("订单不存在,订单已经被取消了，才能解锁库存");
                        //当前库存工作单详情，状态为1，已锁定但是未解锁才可以解锁
                        unLockStock(detail.getSkuId(),detail.getWareId(),detail.getSkuNum(),detailId);
                    }
//                    channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
                }
            }else{
                //消息拒绝后，重新放到队列里，让别人继续消费解锁
//                channel.basicReject(message.getMessageProperties().getDeliveryTag(),true);
                throw new RuntimeException("远程服务失败");
            }

        }else{
            //无需解锁
//            channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
        }
    }

    //防止订单服务卡顿，导致订单状态消息一直改不了，库存消息优先到期，查订单状态为新建状态，什么都不做就走了
    //导致卡顿的订单，永远不能解锁库存
    @Override
    @Transactional
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新的库存解锁状态，防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单找到所有 没有解锁的库存 ， 进行解锁
        List<WareOrderTaskDetailEntity> list = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : list) {
            System.out.println("解锁----------："+entity);
            //解锁
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}